Grinding machine



Feb. 13,1940. GARSIDE' AL 2,190,134

GRINDING MACHINE Filed June 9, 1939 4 Sheets-Sheet 1 FIE-1 JUH I. GHREHDE CFIRL [3.FLYEFIRE Feb. 13, 1940.

J. l. GARSIDE ET AL GRINDING MACHINE Filed June 9, 19:59 Sheets-Sheet 5 Jam] LGHRSIUE EFiRL EFLYgHRE FHGQE Feb. 13, 1 940. I GARSIDE;v AL 2,190,134

GRINDING MACHINE Filed June 9, 1939 4 Sheets-Sheet Jul-IN [.GHREIDE- CHRL. G. FLYEFIRE Patented Feb. 13,; 1940 GRINDING MACHINE John I. Garside, West Boylston, and Carl G. Flygare, Worcester, Mass., assignors to Norton Company, Worcester, Mass., a corporation of Massachusetts Application June 9, 1939, Serial No. 278,330

9 Claims.

I The invention relates to grinding machines, and more particularly to an interlock control mechanism therefor.

One object of the invention is to provide an improved hydraulically operated grinding machine with an interlocked control between the longitudinally movable work supporting table and the transversely movable wheel slide. A further object of theinvention is to provide a chucking grinding machine with a control mechanism which prevents an infeeding movement of the grinding wheel unless the work table is positioned in proper predetermined relation with the operative face of the grinding wheel.

Another object of the invention is to provide a grinding machine in which a manually operable control lever which serves to control the transverse movement of the wheel slide is interlocked with the longitudinally movable work table so that the lever cannot be shifted to initiate a wheel feeding movement unless the work is positioned in a predetermined relationship with the grinding wheel. A further object of the invention is to provide an interlocked control mechanism between a wheel feed control lever and thelongitudinally traversable table which serves to prevent a longitudinal traversing movement of the work table when the wheel is in a forward or grinding position. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiments of the mechanical features of this invention,

gram, showing the hydraulically operated sys--,

tem for moving the grinding machine elements and the electrical control mechanism therefor;

' Fig. 4 is a fragmentary front elevation, on an enlarged scale, of the control lever and interlock mechanism;

Fig. 5 is a right-hand elevation of the parts as shown in Fig.4;

(01. 51--105) Fig. 6 is a fragmentary rear elevation," on an enlarged scale, showing the multi-stop mechanism for controlling the infeeding movementof the grinding wheel; l

Fig. '7 is a fragmentary cross sectional view,

on an enlarged scale, of the dash pot feed nism and feed stops; l v v 1 f Fig. 8 is a cross sectional view, on an enlarged scale, takenapproximately. on the line 8. 8 of- Fig. 6; l i

Fig. 9 is a plan View of the feed stops and the supporting member; 1 Fig. 10 is a fragmentary sectionalview, on an enlarged scale, through the work chuck and spindle; Fig. 11 is a fragmentary cross sectional view taken, approximatelyon the line ll-l l of Fig. 10;

Fig. 12 is a fragmentary detail view showing the respective positions, of the work andgrinding wheels in a loading position; 1;

Fig. 13 is a similar view showingthe position of the work and grinding wheels in performing the first step in the grinding operation;

Fig.,14 is a similar view showing the position of the parts during the second step of the grinding operation;

Fig. 15 is a similar of the parts during the third step ing operation; and i I L g i Fig. 16 is a similar view showing the position of the parts during the fourth or final step; 3

A grinding machine has been illustrated in the drawings comprising a base!!! which supports a longitudinally traversable worktablell l on the usual V-way and fiat way ,(not shown). The. table ,II maybe traversed longitudinally either manuallyorby power by anyof the old and well known manual or power operated mechanisms. For simplicity of illustration, a manually operable traverse mechanism has been illustrated A i 0 rack bar 15 depending from the under side of the table II meshes with a gear l6 which issuprported on a rotatable shaft IT. The shaft I1 also supports a gear l8 which is either formed integral with the gear It or is rigidly connected there: to and arranged to rotate therewith. Thegear l8 meshes with a gear l9 carried on the inner end of a rotatable shaft 20. The outer end of the shaft 20 supports a manually operable traverse wheel 2|. By rotating the hand wheel 2| in either direction, the work supporting table ll may be traversed longitudinally in either directiongas desired. This machine is particularly adapted for grinding a workpiece'bymeans of mechaview, showing the position of the grind- PATENT OFFICE? the plunge-cut method, that is, by feeding the supporting table ll.

grinding wheel directly into the work.

A rotatable grinding wheel til is supported on one end of a rotatable grinding wheel spindle 3i which is journalled in bearings (not shown) in a transversely movable wheel slide 32. I'he wheel slide 32 is arranged to be moved transversely on the usual V-Way and flat way (not shown) on the base). The grinding wheel spindle 3i may be rotated in any well known manner, such as by means of an overhead drive shaft or countershaft or by means of an electric motor 33 which is mounted on the upper surface of the wheel slide 32. The motor 33 is provided with'a motor shaft 34 which carries on its outer end a'driving pulley 35. The pulley 35 is connected by multiple V-belts 36 with a multi-grooved driven pulley 3'! mounted on the outer end .of the wheel spindle 3|. The belt drive above described is commonly known as a multiple V-belt type in which a plurality of belts 35 of V'shaped cross sectional area are connected between multi-v grooved pulleys 35 and 3'1. The wheel slide 32 isarranged for a transverse feeding movement toward andfrom the work supporting table H by means of a wheel feeding mechanism to be hereinafter described.

Wheel feeding mechanism Awheel feeding mechanism is provided to control the feeding movement and adjustment of the grinding wheel 39 toward and from the work The wheel slide 32 is provided with a depending half nut Q53 which meshes with arotatable cross feed screw ii. The feed screw M is rotatably supported at one end by a bearing 42 which is supported in fixed relation to the-base Ill. The other end of the feed screw M is rotatably journalled in a slidably mounted bearing member 43 which is slidably keyed within a cylindrical aperture A l formed within the base lllof'th'e machine. The feed screw ll may be rotated manually for adjusting the position of the wheel slide 32 in setting up the machine by means of a manually operable feeding mechanism to behereinafter described.

In order that the wheel slide 32 may be rapidly-'moved toward the work supporting table toggrind a work piece by the plunge-cut method, the feed screw is connected to a piston rod 65.

' A -fluid pressure cylinder 4% is formed within, the

base l0-of the'machine and contains a slidably mounted piston 41 which is connected with or formed integral with the piston rod it. As illustrated in' Fig. 3, the other end of the piston rod 45 -is fixedly connected to the slidably mounted bearing member 63 so that when fluid pressure is admitted to either end chamber of the cylinder 46, the endwise movement of the piston rod 45'will be transmitted to produce an axial or endwise movement of the feed screw ll which in turn transmits this motion to produce a transverse feeding movement of the wheel slide 32 and the rotatable grinding wheel 3?). A motor driven. fluid pressure pump it is arranged to pump fluid-through a pipe 43 from a reservoir Ell-which is-preferably located within the base Id of the .mach-ine. The pump 48 forces fluid under pressure through a pipe M to a feed control .va1ve52. The feed control valve 52 is preferably a piston type valve comprising a valve stem 53 having formed integrally therewith a plurality of valve pistons. In the position of the valve 52 (Fig. 3), fluid under pressure passing through the pipe 5! enters a valve chamber ri l and passes through a passage 55 into a cylinder In this position of the valve, fluid under pressure passing through the pipe 5! will enter the valve chamber 55, and pass through a passage into the cylinder chamber 51 to initiate a movement of the piston t? toward the left which in turn transmits a movement toward the left of the feed screw ll, the half nut it, the wheel slide 32, and the rotatable grinding wheel 36 to cause the wheel as to move transversely so as to approach the work supporting table I l.

The valve stem 53 projects from the front of the machine base and is connected by means of a stud 68 with the upper end of a pivotally mounted lever @l which is in turn fixedly mounted at one end of a rock shaft 6?. which is journalled in a bearing 13 fixedly mounted relative to the base it). The right-hand end (Fig. 4) of the rock shaft 62 is provided with a lever 64 which is fixedly mounted thereon. The lever 64 carries at its upper end a pair of spaced parallel pins or studs 65 and 5% which are engaged by a manually operable control lever to be hereinafter described.

Dash pot The piston and cylinder mechanism, above described, serves to cause the grinding wheel 38 rapidly to approach or recede from the work piece. In order to reduce the rapid approaching movement to a predetermined grinding feed, it is desirable to provide a wheel feed controlling mechanism, such as a dash pot mechanism, which may be rendered efiective when the grinding wheel to is about to contact with the surface of the work piece to be ground. As illustrated in Fig. 3, an outwardly extending casing '53 is fixed to the end of the cylinder t5 and contains a pair of diametrically arran ed spaced dash pot pistons E1 and ill which slide within dash pot cylinders T! and 72. The dash pot pistons are normally held in a rearward position by springs 73 and 14, respectively. During the rapid approach of the grinding wheel iii), the dash pot istons are inoperative.

The piston rod d5 extends toward the rear of the machine and is provided with a slidably mounted sleeve 75. The sleeve F5 is provided with diametrically projecting arms T9 and TI which are provided with bosses l8 and i9, respectively. The bosses l8 and "it are positioned and arranged to engage the dash pot pistons 89 and ill, respectively, at a point substantially coinciding with the axes of the dash pot pistons. When fluid is admitted under pressure .to the cylinder chamber 5'? to cause the grinding wheel 38 to move toward'the work piece, the rapid approaching movement continues until an-adjust-- able collar 39, carried by a threaded end portion 3!, engages the end of the sleeve '55. The continued movement of the piston ll is resisted by the'dash pot pistons t9 and ill, which forces fluid under pressure from the dash pot cylinders H and '52 through an adjustable needle valve 82 into a reservoir 83. By adjustment of the needle valve 82, the exhaust of fluid from the dash pot cylinders H and '52 may be readily controlled to produce the desired grinding infeed,

movement of the s1ide'32 and the grinding wheels so that the grinding wheel-willib'e moved into the work piece to grind the same -at the desired rate of feed. This dash pot mechanism is substantially the same as that shown in the United States Patent No. 2,101,970 dated December "7,

1937, to Raymond A. Cole and Charles H.'Amidon, and since this feature is not considered to be a part of the present invention, the detailsof disclosure have not been completely described herein. For details of disclosure not contained herein, reference may be had to the prior patent above mentioned.

The fluid reservoir 83 and the dash pot cylinders 'II and I2 form a separate fluid system which is independent of the main feed cylinder 46 and its control valve 52. In order to fill the reservoir 83, a pipe 81 is connected with the pipe 5| which leads from the fluid pressure pump 48, and a valve 88 in the pipe 81 serves to admit fluid from the pump into the reservoir 83 to fill the dash pot system in settingup the machine and to maintain it full during use. An overflow pipe BI is provided which is connected with the pipe 59 to convey excess fluid from the reservoir 83 to the reservoir 50. If desired, the valve 88 may be maintained slightly open during use of the machine so that the reservoir 83 is at all times filled and any overflow therefrom may readily return tothe reservoir 50.

In order to allow the dash pot cylinder chambers 9| and 92 to fill quickly as the Wheel slide 32 moves rearwardly, a ball check valve 90 is provided inthe dash pot cylinder casing 68 which is connected by means of a pipe 89 with the reservoir 83. By providing this ball check by-pass, fluid is quickly admitted into the dash pot cylinders and does not have to be drawn in wholly through the needle valve 82. I

Positive step 30 which serves to rough grind a piece of work to the required rough size, andalso a finish grinding wheel 3011 which is of a smaller diameter and is mounted adjacent to the grinding wheel 30 so that after the work piece has been rough ground by means of the wheel 30, the work supporting table II may be traversed longitudinally toward the left (Fig. 1) to position the work piece in operative relation with the finish grinding wheel 30a to facilitate a finish grinding operation. In order that the work piece may be rough ground to a predetermined extent, after which it may be finish ground to a predetermined size, it is desirable to provide a positive stop mechanism comprising a plurality of stop elements which may be, automatically moved into an operating position in timed relation with the longitudinal positioning movement of the work supporting table II. As illustrated in Fig. '7, an adjustable stop sleeve 84 surrounds the sleeve I5 and is held in adjusted position thereon by means of a lock nut 85. The positive stop sleeve 84 is arranged to engage the end face of the dash pot cylinder head BIipositively to limit the infeeding 30 and 30a. I

A 'multi-stop mechanism is provided for limiting the infeedingmovement of the wheel slide to limitthe infeedingmovement of the grindingwheels 30 and 30a so as to grinda work piece first to a predetermined rough size and then to a predetermined finish size, This multi-stop mechanism is preferably arranged to be automatically actuated by and in timed relation with the longitudinal positioning movement of the work supporting table I l As illustrated in the drawings, a bracket H is fixedly mounted onthe dash pot cylinder head 86 and projects downwardly therefrom and is provided with a bearing portion II I which serves rotatably to support a rock shaft H2. The rock shaft H2 supports a sector-shaped frame H3. The frame I I3 is provided with an arcuate-shaped elongated slot H4 which surrounds the threaded portion 8| of the piston rod 45. The frame H3 serves as a support for a plurality of spaced pairs of stop blocks H5, H6 and II! which are arranged so as to be engaged by the collar 80. The stop blocks H5, II 6 and III are arranged to be moved into an operative engagement with the end of, the sleeve I so that further movement of the collar 8!] serves through stop blocks I I5, H6 or III to move the sleeve I5 endwise so that the bosses 18 and 19 engage the dash pot pistons 69 and Ill, respectively, after which the rapid approach of the grinding wheels 30 and 30a is reduced to a slower grindingfeed. The slow grinding feed continues until the positive stop sleeve 84 carried by the sleeve I5 engages the dash pot cylinder head 86 topositively limit the forward feed of the grinding wheels 30 and 30a. The pairs of stop blocks H5, H6 and II! are each provided with a supporting stud which is slidably keyed within 'an aperture or hole in the bracket H3, and are normally held in position I with the stop blocks H5, I I 6 and II I yieldably engaging the bracket I I3 by means of springs I I8 which surround the stud. The springs IIB are I operative position .with relation to the collar 80 and the sleeve I5. 7

In order that the stop blocks II 5, H6 and II 1 may be moved in timed relation with the table movement, a linkage mechanism is provided I connecting the bracket I 20 with the table I I. A

bracket I2I- is fixedly mounted on the side of the bracket I20 and is pivotally connected toa link I22 by means of a stud I23. The link I22 is connected to a pivotally mounted rock arm I24 by means of a stud I25. The rock arm I24 is pivotally supported by means, of a stud I26 which is fixedly mounted on the front of the machine base I0. The upper end of the rockarm I24 is pivotally connected by means of a stud I21 with a link I28. The upper end of the link I28 is provided with a hook-shaped portion I29 which is arranged to detachably engage a stud I30,

which is either fixedly mounted on or formed integral with a slide block I3I which is-adj justably mounted by means'of bolts I32 and I33 oarried' by a' T slot I34 formed in the front edge 'of the table II.

It is desirable to provide a readily detachable connection between the link I28 and the stud Hill-so that during a grinding wheel truing operation the feed stop mechanism may be readily disconnected before the truing operation is started and may be readily connected again after the wheel truing operation has been completed. A spring-pressed detent I35 normally serves to hold the hook-shaped end I29 of the link I28 in engagement with the stud I38. A stud I36 is fixedly mounted to the detent I35 and is arranged to slide longitudinally in an elongated slot I31 formed in the link I28. A handle I39 is fixedly connected to the upper end of the stud I38 and serves to facilitate withdrawal of the detent I35 when it is desired to disconnect the stop mechanism from the table I I, so as to allow independent movement of the table without affecting the position of the stop mechanism and its operating parts.

In order to attain one of the main objects of the invention, a suitable interconnection or interlock is provided between the wheel feeding movement and the table traversing movement. A manually operable control lever I45 is connected by means of a bracket I46 with a pivotally mounted lever I41. The lever I41 is pivotally supported by means of a stud I 48 supported in a pair of spaced bosses I49, and I 58 which are formed integral with the bracket I253. The lever I45 is positioned between the studs 65 and 65 and is preferably of a size to fit the space therebetween. Movement of the control lever I45 about the supporting stud I48 serves, through the studs 65 and 6B, the lever 64, the rock shaft 62, the lever BI, to shift the valve stem 53 so as I to shiftthe control valve 52 to initiate either a forward or rearward movement of the grinding wheel 33 and its supporting slide 32.

In order to prevent longitudinal shifting of the work sup-porting table when the grinding wheel is in an operative grinding position, and to prevent an infeeding movement of the grinding wheel unless the work supporting table is positioned in one of a series of predetermined positions, a suitable interlock is provided to control the shifting movement of the lever I45. An arcuate-shaped member IE8 is fixedly mounted on the base of the machine. The arcuate member IE8 is provided with a plurality of notches IISI, Iefi, I63 and I54 in its lower surface. The lever M is provided with an adjustably positioned member I59 which is arranged to be clamped thereon by means of clamping screws IE5. The member I59 is provided with an integral clamping device I66 which serves as a support for astud I61. The stud I 61 is provided with enlarged head I68 which is spaced from the member I65 by a distance slightly greater than the thickness of the arcuate member ms. The head I88 projects upwardly and is shaped to mate with the notches Isl, I62, I63 and E54.

In the position of the parts (Fig. 4), the head I88 is aligned with the notch IIiI and the lever I45 may be swung toward the operator so that the head I68 of the stud I61 slides within the notch IiSI, thus shifting the control valve 52 to initiate a forward feeding movement of the grinding wheels 33 and 39a. During the time interval in which the grinding wheel is moved toward and from the work to grind the same, the head I68 engaging the notch It! prevents a longitudinal traversing movement of the table II and thereby "prevents a shifting movement of the stop plate member H3. After the grinding operation has been completed, the lever I45 is then moved toward the rear of the machine to shift the control valve 52 into the position illustrated in Fig. 3, which movement slides the head I68 of the stud IE1 into the position illustrated in Fig. 5. In this position of the lever I45, the lever together with the actuating mechanism for the feed stop may be moved longitudinally by the traversing movement of the work supporting table II. During the longitudinal traversing movement of the table, the head I68 of the stud I61 rides along the rear face of the segment I58 and thus locks the lever I45 so as to prevent its movement in a counterclockwise direction (Fig. 5) to initiate another infeeding movement of the grinding wheel until the head I68 is aligned with one of the notches IBI, I62, I63 or I64, thus providing an interlock to prevent an infeeding movement of the grinding wheel during the table traversing movement unless the work piece is located in 'a predetermined position for the next grinding operation.

Manual feed adjustment The feed screw4I is arranged so that it may be rotated manually to adjust the position of the wheel slide 32 in setting up the machine for a given grinding operation or for compensating for wheel wear during grinding. The feed screw 4! is slidably keyed at its forward end within a rotatable sleeve I16. The sleeve I is fixedly mounted on the inner end of a rotatable shaft I1I which supports a gear I12 meshing with a gear I13. The gear I13 is formed on the end of a rotatably supported shaft I14. The shaft I14 supports on its outer end a manually operable feed wheel I15. The feed screw may be rotated manually by rotation of the feed wheel I in either direction to adjust the position of the grinding wheels 30 and 30a. together with their supporting slide 32. A stop pawl I16 is pivotally mounted on a stud I11 on the base ID. The pawl I16 is arranged to engage an abutment (not shown) carried by the manually operable feed wheel I15. The manually operable feed wheel I15 is provided with a micrometer adjusting mechanism I18 to facilitate adjustment of the stop abutment relative to the feed wheel I15.

This mechanism has not been illustrated in detail, since it is not considered to be part of the present invention. Reference may be had to the prior U. S. patent to C. H. Norton No. 762,838

dated June 14, 1904, for details of disclosure not I found herein.

' Work support A rotatable work support is provided on the work supporting table II rotatably to support a work piece in operative relation with the grinding wheels 38 and 30a. for a grinding operation. In thepreferredconstruction, a live spindle work rotating and supporting mechanism is provided which is-substantiallythe same as that shown in the prior U. S. patent to Cole and Amidon Nof 2,101,790 above referred to. This mechanism may comprise a headstock I88 which is arranged rotatably to support a spindle I8I in bearings I82 and I83, respectively. The headstock I88 is provided with a surface which mates with a correspondingly shaped surface on the work supporting table II whereby the headstock may be adjusted longitudinally therealong and clamped in adjusted position in a manner similar to that shown in the prior patent above referred to.

The work supporting spindle I 8I may be rotated by means of an electric motor I which is mounted on top of the headstock I89. A motor shaft I88 is provided with a multi-V-grooved pulley I81 which is connected by multiple V-belts I88 with a multi-V-grooved pulley I89 which is keyed to the end of the work supporting spindle I8I and is held in adjusted position thereon by means of a collar I99.

In order that the electric motor I85 may be readily controlled from the operators station in front of the machine base. atw'o-button snap switch I9II92 is provided which is preferably mounted on the front of the headstock I89. A lever I93 is pivotally mounted on a pair of op posed studs I94. When the lever I93 isrocked in a clockwise direction (Fig. 3), that is, when the knob moves toward the headstock E99, the push button I9I is actuated to close a circuit through a relay switch 296 to start rotation of the headstock motor I85. Similarly, if the lever I93'is rocked in a counterclockwise, direction (Fig. 3), that iswhen the knob moves away from the headstock I89, the push button I92 is actuated to close a-circuit through a relay switch 291 so as to break the circuit to the motor I85 and thus stop the motor I85 to stop the rotation of the work supporting spindle I8I.

In grinding certain types of work, it is desirable to provide a live spindle work supporting member which is arranged so that the work piece may be inserted, ground and removed therefrom without stopping the rotation of the spindle.

The work holding mechanism illustrated inthe drawings is particularly adapted for grinding a cylindricallyshaped work piece having aneccentric portion I 99 oh its end. A work piece I95 having an eccentric portion I99 is supported in a collet I91 having a central aperture which is eccentric relative to the axis of rotation of the headstock spindle I8I by an amount equal to the offset of the eccentric I96 relative to the work piece I99. The work piece is clamped in position within the collet I91 by -means of a clamping member I98, the upper surface of which is provided with two spaced V- shaped portions I98a and I98b which engage the cylindrical portion I95 of the work piece. The

under surface of the clamping member I98 is provided with a cam face I980 which rides on a stud I99 fixed in the rotatable part of the headstock." The clamping member I98 is connected to aslide rod 299 which passes through'a central aperture within the headstock spindle I8I.- A spring 29I serves normally to exert a pressure tending to move the clamping member I98 toward the left (Fig. .3) in a clamped position.

The outer end of the rod 299 is provided with a spool-shaped member 292 which is pivotally connected to the upper end of a rock arm 293.

The rock arm 293 is pivotally mountedon a stud 294 which is fixed to the headstock frame I89.

The lowerend of the rock arm 293 is y0keshaped and is connected by means of a stud 295 with a slidablymounted piston rod296. A piston 297 is mounted on the right-hand end of the piston rod 298 (Fig. 3). The piston 29'Iis slidably mounted within a cylinder 298 which is formed as an integral part of the headstock I89.

A spring 299 surrounds the piston rod 296 andis interposed between the piston 291 and the left hand end of the cylinder 298 (Fig. 3) The spring 299 is a compressionsprin'g and normally serves to exert a pressure to move the rod 296 toward the right (Fig. 3} to cause the clamping member mounted thereon.

support for the opposed studs I94 and I95 which:

I98 to move toward the left to clamp the work piece I95 in operativeposition within the headstock I89, the spring299 having sufiicient compression to exert the required clamping pressure.

In order to release the work piece, a fluid pressure mechanism is provided. Fluid. under pressure from the pump 48 passing through the pipe 5| passes through a pipe 2I9 toa valve 2 and through a pipe 2I2 into a cylinder chamber 2I9 to cause the piston29l to move toward the left (Fig. 3) ,i which transmits amotion against the compression or the spring 299 to move the clamping member i98 toward the right (Fig. 3)v to unclamp the work piece- I95. The position of the parts as illustratedinFig. 3 shows the work piece E95 in a clamped operative position. In

this position of the parts, the pipe 2I2 is con-. nected by an exhaust pipeZHi to allow fluid within the cylinder chamber '2 I3 to 'exhaust and re.- turn to the reservoir 59within the base. I9. The valve 2I I is preferably a rotary type valve having a rotary valve member 2I5 which is provided,

with a valve stem 2I6 having a collar 2" fixedly The collar 2|"! serves as'a pivotally support the headstock control lever I 93..

When the headstock control lever I93is rotated in a counter-clockwise direction into dotted line position I93a (Fig. 3), the rotary. valve member 2I5 isconnected to exhaust fiuidfrom the chain-y ber 2I3 and thereby releases the compression of thespri'ng 299 to clamp the work piece I95 in operative position within the collar I91. I :j .When it is desired to release the workpiece I95 after a grinding operation has been com-' pleted, the lever I93 isrocked in a clockwisedirection from the position I93a to turn the valve member 2I5 in a clockwise direction into .a position whereby fluid under pressure passing throughthe pipe-2I9 passes throughthe pipe'2 I2 into the cylinder chamber 2I3 to move the piston j 29? toward the left to move the clamping member I98 toward the right (Fig. V3) to unclamp the work piece I95 so that it' maybe removed from theheadstock and replaced with .anunground work piece. I The work is preferably loaded into the bullet I9'I by means of a special loadingfixture which it is not considered-to be a part of the present invention. This locating fixture serves to locate the'eccentric portion I96 so that its'axis coin-f rotation of the headstock cides withthe axis of spindle I8I. i The various steps in the grinding operation are diagrammatically illustrated in Figs. 12 to 16 inclusive. Fig. 12 shows the relative positions of the grinding wheels 39 and 390. when thewo'rk piece I95 isloaded into the'machine; Fig. 13 shows the first step in the grinding operation with thegrinding wheel 39 in engagement with. the eccentric pin I96 to rough grind the same to a predetermined size; Fig. l ls'hows the sec- 0nd step "in the operation; in which the" work piece has been traversed toward the left and has not been illustrated in this application, since the end face of the eccentric stud I96is rough 1 traversed a further distance toward the left and within the work sup-porting collet l9'I.

the side face of the grinding wheel 39a fed into engagement with the end face of the eccentric pin I96 to finish grind the same.

..-.The operation of this improved grinding machine will be readily apparent from the foregoing disclosure. Assuming the wheel slide 32 to be in its rearmost position, a work piece I95 is set inaa loadingfixture (not shown) and is inserted The lever I93. is then moved in a counterclockwise direction into the dotted line position indicated in Fig. 3 to exhaustfluid within the cylinder chamber: II3, thereby releasing the compression of the spring 293 which serves to move the clamping member I98toward the left (Fig. 3). The cam surface formed on the under side of the clamping member I99 riding on the pin I 99 serves to move the clamping member I98 upwardly,

, 'rigidlyto clamp the work piece 595 in position within the work holding collet IG'I. In this position ofthe parts, the lever I93 is rocked toward the headstock to actuate the push button switch I9I, thereby operating the relay switch 296 to startthe electric motor I85 which in turn starts rotation of the headstock spindle I8! and the work piece I95. 1

The grinding wheels 39 and 38a are rotated by the closing of a circuit to start the motor 33.

The lever I45 may then be moved toward the operator, that is, in a counterclockwise direction I BI in the arcuate member I69. The grinding operation proceeds until the collar adjacent to' the rear end of the piston rod engages the stop block I I5 and moves the stop block into a'stopped position against the end of thesleeve to positively limitthe infeeding movement of the grinding wheel. .This movement causes the grinding wheel 39 to move from the position illustrated in Fig. 12 into the position illustrated in Fig. 13.

The grinding wheel 30 being set for a rough grinding operation, grinds theeccentric portion I95 of the workpiece I95 to the required extent. Thewhand traverse-wheel is then turned to cause aslight movement of the table Iltoward the 'rightso that the shoulder of the work piece is brought up into engagement with the side face of the wheel 39 to cleanup the shoulder thereon.

The control lever I45 is then moved toward the" machine base or in a clockwise direction (Fig. 5) which shifts the wheel feed control valve to produce a rearward movement of the wheel slide 32.and the grinding wheels 30 and 39a. At thesame time, the. head I68 moves out of the notch IiSI in the member I59 so that the table is traversed longitudinally by manual rotation of the hand wheel M to move the work piece so that the grinding wheel 39 may be fed into the position illustrated in Fig. 14 to grind the end face of the eccentric portion I96 of the work piece I95, During this traversing movement of vInthis position of the parts, the head I'BB of the stud I6! is aligned with the notch I62. The wheel feeds into the work to a position illustrated in Fig. 14: to rough grind the end face of the eccentric I96 to the required extent, after which the lever M5 is moved toward the machine, that is, in a clockwise direction (Fig. 5) to cause a rearward movement of the wheel slide, after which the table may be traversed to a position to bring the eccentric I96 into operative relation with the finish grinding wheel 36a, as illustrated in Fig. 15. In this position of the parts, thelever 545 may be again moved away from. the machine, that is, in a counterclockwise direction (Fig. 5), in which position the head I68 of the stud I67 is aligned with the notch I53 and produces a shifting movement of the control valve 52 to cause an infeeding movement of the wheel slide 32 which continues until the grinding wheel 39a grinds the periphery of the eccentric I96 to the required extent. When the eccentric, has reached a predetermined size, the table II is jogged toward the right a suflicient distance so that the side face of the wheel contacts and grinds or cleans up the shoulder-on the work piece. rearwardly, that is, in a clockwise direction (Fig. 5), to cause a rearward movement of the wheel slide 32 and the grindingwheel 39a, after which the hand traverse wheel 2I may then be rotated to again traversethe table II toward the left, so that the work piece I95 bears the relation with the wheel 36a as shown in Fig. 16, in which position the head I58 of the stud I6! is aligned with the notch I64.

Inthis position of the parts, the lever I45 may be again shifted to start an advancing or infeeding movement of the grinding wheel slide 32 and the grinding wheel 39a so that the finish grinding wheel eta grinds the end face of the eccentric portion I95 of the work piece. The lever I45 may then be moved toward the machine, that is, in a clockwise direction (Fig. 5) to cause a rearward movement of the grinding wheel slide 32 and the grinding wheels 30 and 30a. The work table II may then be traversed toward the right by rotation of the manually operable traverse wheel 2| into its initial position with an adjustable stop dog 229 carried by the T-slot I34 on the table II in engagement with a fixed stop abutment 22I mounted on the front of the machine base. The knob of the control lever I93 is then pulled away from the headstock so that the lever I93 actuates the push button switch I92 to operate the relay switch 29'! to stop the rotation of the headstock motor I85. At, the same time, the lever I93 is then rocked in a clockwise direction to shift the rotary valve member 2I5 into. a position to admit fluid under pressure through the pipe 2I2 into the cylinder chamber 2I3 to unclamp the work piece by shifting the clamping member I98 toward the right (Fig. 3). The finish ground work piece maythen be removed from. the colletv I9! and a new piece, in its locating adapter, inserted in position for the next grinding operation.

- During the traversing movement of the table II, the head I58 on the stud IB'I slides along the rear face of the sector I59 and prevents a shifting movement of the control lever I45 to produce an infeeding movement. Similarly, when the head I68 of the stud I6! is in engagement with the notches IBI, I52, I53, or I64, the table cannot be traversed due to the fact that such movement is prevented by the engagement of the head, I68 with the notches in the-arcuate.

The lever I45 is then shifted member I 60, thus serving as an interlock to prevent an infeeding movement of the grinding wheel during a longitudinal positioning movement of the work piece, and similarly preventing a longitudinal movement of the work piece during an infeed grinding movement of thewheel slide 32.

While the machine disclosed in this application illustrates the grinding of a work piece having an. eccentric pin projecting fromits end, this machine is equally applicable to grinding other types' of work pieces, such as multi-diamet'ers and the like, it being merely necessary to change the eccentric quill or bushing l9! for a bushing of the required size and shape to accommodate the work piece to be ground. As illustrated in Fig. 10 of the drawings, the collet I9! is supported in a work holdingplate 250 which is removably supported in a recessed portion formed in the right-hand end of the headstock spindle. The member 250 is provided with a frusto -conical peripheral surface 252 which is engaged by a plurality of symmetrically positioned adjusting and clamping ,screws 253. and 254 (only two of which have beenillustrated) by means of which the collet I91 and the member 250 may be held in position and may also be ad- 'J'usted laterally as desired in setting up the machine for a given grinding operation.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodi merits may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

We claim: 1. In agrinding machine having a longitudinally movable work supporting table, a transversely movable wheel slide, a rotatable grinding wheel thereon, means to traverse said table longitudinallyjmeans including a control lever to move the wheel slide transversely in either direction, and means actuated by the longitudinal movement of said table to hold said lever so as to prevent an infeeding movement of the wheel slide except when the table is in a predetermined grinding position.

2. In a grinding machine having a longitudinally movable work supporting table, a transversely movable wheel slide, a rotatable grinding wheel on said slide, a manually operable mechanism to traverse said table longitudinally, a fluid pressure system including a piston and cylinder operatively connected to move the wheel slide transversely in either direction, a control valve therefor,-a control lever for actuating said valve, and means actuated by longitudinal movement of said table to hold said lever so as to prevent an infeeding movement of the wheel slide except when the table is in a predetermined grinding position.

3. In a grinding machine having a longitudinally movable work table, a transversely movable wheel slide, a rotatable grinding wheel thereon,

means to traverse said table longitudinally, means including a control lever to move the wheel slide transversely in either direction, a notched quadrant, a stud on said lever, a head on the stud which is shaped to mate with the notches in said quadrant, and means actuated by longitudinal movement of said table to ,causea relative movement between the quadrant and head so as to prevent movementof the lever to cause an infeed of the grinding wheel except when the table is in a predetermined grinding position.

4. In a grinding machine having a longitudinally movable work supporting table, a transversely movable wheel slide, a rotatable grinding wheel on said slide, means to traverse said table longitudinally, means including {a control lever to move the wheel slide transversely in either direction, a plurality of stops successively to limit the infeeding of the grinding wheel, means actuated by the longitudinal movement of the table to successively move said stops into an operative position, and means-actuated by said table movement to hold, said lever so as to prevent an.in-

' feeding movement of the wheel slide except when the table is in a predetermined grinding position.

5. In a grinding machine having a longitudinally movable work supportingutable, a transversely movable wheel slide, a rotatable. grinding wheel on said slide, a manually operable mechanism to traverse said table longitudinally, a fluid pressure system including a pistonand cylinder operatively connected to move the wheel slide" transversely in either direction, a control valve therefor, a control lever for actuating said valve,

a plurality of stops successively to limit the inis in a predetermined grinding position. all matter hereinbefore set forth or shown-in 6. In a grinding machine having a longitudinally movable work supporting table, atransversely movable wheel slide, a rotatable grinding wheel, a traversing mechanism to, traverse said table longitudinally, a fluid pressure system innected when moved in a longitudinal direction to successively move said stops onto an operative position and which is operatively connected when moved in a transverse direction to actuate said control valve to produce a movement of the wheel slide in either direction.

7. In a grinding machine having a longitudinally movable work supporting table, a transversely movable wheel slide, a rotatable grinding wheel thereon, a traversing machinism to traverse said table longitudinally, a fluid pressure system including a piston and cylinder operatively connected to move the wheel slide transversely in either direction, a control valve therefore, a plurality of stops successively to limit the infeeding movement of the grinding wheel, a manually operable control lever which is operatively connected when moved in a longitudinal direction to successively move said stops into an operative position and which is operatively connected when moved ina transverse direction to actuate said control valve to produce a transverse movement of the wheel slide in either direction, and an interlock for said lever which prevents shifting of the feed stops during movement of the wheel slide and prevents movement of the'wheel slide during shifting of the feed stops.

8. In a grinding machine having a longitudinally movable work supporting table, a transversely movable wheel slide, a rotatable grinding wheel thereon, a traversing mechanism to travelse" said table longitudinally, a fluid pressure system including a piston and cylinder operatively connected to move the Wheel slide transversely in either direction, a control valve therefor, a plurality of stops successively to limit the infeeding movement of the grinding Wheel, a control lever operatively connected to actuate said valve and said stops, detachable connections between said table and said lever whereby the lever is moved longitudinally when the table is traversed automatically to position successive stops in operative position, and means to prevent longitudinal movement of the table during the transverse movement of the wheel slide.

9. Inv a grinding machine having a longitudinally movable work supporting table, a transversely movable wheel slide, a rotatable grinding wheel thereon, a traversing mechanism to traverse the table longitudinally, a fluid pressure system including a piston and cylinder operatively connected to move the Wheel slide transversely in either direction, a control lever therefore, a plurality of stops successively to limit the infeeding movement of the grinding wheel, a control lever operatively connected to actuate said valve and said stops, said connections being arranged sothat a transverse movement of the lever serves to shift the valve to produce a transverse movement of the grinding wheel slide, connections between said table and said lever whereby movement of the table moves the lever longitudinally, and means to prevent shifting the lever transversely and thereby prevent an inieeding movement of the slide during -a longitudinal traversing movement of the work table.

JOHN I. GARSIDE. CARL G. FLYGARE.

CERTIFICATE OF CORRECTION. Patent No. 2,190,15h. February 15, 191 0.

JOHN I. GARSIDE, ET AL.

It is hereby certified that error appears in the printed specification of the above numberedpatent requiring correction as follows: Page 8, sec- 0nd column, line 6, claim 9, for the word "lever" read -valve--; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this lhth day of May,'A. D. 19LLO.

Henry Van Arsdal'e, (Sea/1) V Acting Commissioner of Patents. 

